package org.homly.tool;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class StringTool {

	/*
	 * 判断是否整数
	 */
	public static boolean isNumber(String s) {

		if (s == null) {
			return false;
		}

		Pattern p = Pattern.compile("(-)?[0-9]+");
		Matcher m = p.matcher(s.trim());

		return m.matches();
	}

	/*
	 * 转换字符串为Date类型
	 * 转换失败则返回当前时间
	 */
	public static Date parseDate(String dateS) {

		Date date = null;

		try {
			SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.S");
			date = sdf.parse(dateS);
		} catch (Exception e) {
			date = new Date();
		}

		return date;
	}

	/*
	 * 获取当前时间
	 * 格式：2012年12月3日 星期一
	 */
	public static String getDate() {

		String dateS = StringTool.getDate("yyyy年M月d日 E");

		return dateS;
	}
	public static String getDate(String format) {

		String dateS = null;

		try {
			if (format == null || "".equals(format)) {
				format = "yyyy年M月d日 E";
			}
			SimpleDateFormat sdf = new SimpleDateFormat(format);
			Date date = new Date();
			dateS = sdf.format(date);
		} catch (Exception e) {
			dateS = "";
		}

		return dateS;
	}

	public static String escape(String src) {

		int i;
		char j;
		StringBuffer tmp = new StringBuffer();
		tmp.ensureCapacity(src.length() * 6);
		for (i = 0; i < src.length(); i++) {
			j = src.charAt(i);
			if (Character.isDigit(j) || Character.isLowerCase(j) ||
					Character.isUpperCase(j))
				tmp.append(j);
			else if (j < 256) {
				tmp.append("%");
				if (j < 16)
					tmp.append("0");
				tmp.append(Integer.toString(j, 16));
			} else {
				tmp.append("%u");
				tmp.append(Integer.toString(j, 16));
			}
		}
		return tmp.toString();
	}

	public static String unescape(String src) {

		StringBuffer tmp = new StringBuffer();
		tmp.ensureCapacity(src.length());
		int lastPos = 0, pos = 0;
		char ch;
		while (lastPos < src.length()) {
			pos = src.indexOf("%", lastPos);
			if (pos == lastPos) {
				if (src.charAt(pos + 1) == 'u') {
					ch = (char) Integer.parseInt(src.substring(pos + 2, pos + 6), 16);
					tmp.append(ch);
					lastPos = pos + 6;
				} else {
					ch = (char) Integer.parseInt(src.substring(pos + 1, pos + 3), 16);
					tmp.append(ch);
					lastPos = pos + 3;
				}
			} else {
				if (pos == -1) {
					tmp.append(src.substring(lastPos));
					lastPos = src.length();
				} else {
					tmp.append(src.substring(lastPos, pos));
					lastPos = pos;
				}
			}
		}
		return tmp.toString();
	}

	/**
	* @disc 对字符串重新编码
	* @param src
	* @return 
	*/
	public static String isoToGB(String src) {

		String strRet = null;
		try {
			strRet = new String(src.getBytes("ISO_8859_1"), "GB2312");
		} catch (Exception e) {
		}
		return strRet;
	}

	/**
	* @disc 对字符串重新编码
	* @param src
	* @return 
	*/
	public static String isoToUTF(String src) {

		String strRet = null;
		try {
			strRet = new String(src.getBytes("ISO_8859_1"), "UTF-8");
		} catch (Exception e) {
		}
		return strRet;
	}

}
